Return-Path: Received: from mail.viclink.com ([66.129.220.6] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 555849 for flyrotary@lancaironline.net; Sat, 04 Dec 2004 11:24:33 -0500 Received-SPF: none receiver=logan.com; client-ip=66.129.220.6; envelope-from=pjmick@viclink.com Received: from viclink.com (p145.AS1.viclink.com [66.129.192.145]) by mail.viclink.com (8.11.7/8.11.7) with ESMTP id iB4GNV809277 for ; Sat, 4 Dec 2004 08:23:31 -0800 (PST) Message-ID: <41B1E42F.8020201@viclink.com> Date: Sat, 04 Dec 2004 08:22:07 -0800 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: power sag References: Content-Type: multipart/alternative; boundary="------------050503040602050606060406" --------------050503040602050606060406 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I get the spark plug sag after about 50-100 hours on a set of leading plugs. It usually happens the first time after takeoff and I'm a few hundred feet in the air, but it's never that "drastic", just 100-200 RPM drop. It does get your attention! Kelly Troyer wrote: > Steve, > May be the famous "Spark Plug Sag" as reported by Tracy and Ed !! > -- > Kelly Troyer > Dyke Delta/13B/RD1C/EC2 > > > > > -------------- Original message from "Steve Brooks" > : -------------- > > > > I went to South Carolina Thursday to replace the fuel regulator, > and do some > > flying. I replaced the regulator, and ran the engine some on > Thursday, but > > no flying because it was getting dark. > > > > On Saturday, I went to fly, and had some trouble getting it to > stay running > > due to the cold temperatures. I probably didn't keep it rich > enough, long > > enough. I taxied out to the far end of the runway (5000'), and > took the > > runway for take off. > > > > As I accelerated to about 90 kts, I was just rotating when to > power dropped > > substantially. I cut the throttle, and aborted the takeoff. > > > > I don't know exactly what caused the sag. I pulled the throttle > all the way > > back during the aborted takeoff, and the engine died. I have my > idle stop > > set a little low (400 RPM's), and usually don't pull it all the > way off, but > > even when I do, it has never died. > > > > I restarted it, and ran the power up to about 4000, and it > seemed OK. > > > > Another issue with my right main wheel bearing prevented me from > making any > > more high speed runs. The right wheel has been making noise, and > I was > > trying to resolve it with the mfg, but during the aborted take > off, it > > really made allot of noise, and also vibrated pretty good at one > speed, so I > > decided that I better get that fixed before doing any more flying. > > > > I changed the fuel regulator, so I guess that it could have been > some air > > still in the fuel line, but the engine had probably run for at > least 10 > > minutes prior to the take off roll. It also could have been some > water, > > though I've never found any to date during preflight. The engine > was > > running at 5 lbs of boost and abo ut 5000 RPM's. It was about 45 > degrees, > > and the plane was accelerating very strong prior to the power > loss. I don't > > know if it would have picked back up, but I was glad that it > didn't happen 5 > > seconds later. > > > > Steve Brooks > > > > > > >> Homepage: http://www.flyrotary.com/ > > >> Archive: http://lancaironline.net/lists/flyrotary/List.html > --------------050503040602050606060406 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I get the spark plug sag after about 50-100 hours on a set of leading plugs. It usually happens the first time after takeoff and I'm a few hundred feet in the air, but it's never that "drastic", just 100-200 RPM drop. It does get your attention!

Kelly Troyer wrote:
Steve,
   May be the famous "Spark Plug Sag" as reported by Tracy and Ed !!
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from "Steve Brooks" <prvt_pilot@yahoo.com>: --------------


> I went to South Carolina Thursday to replace the fuel regulator, and do some
> flying. I replaced the regulator, and ran the engine some on Thursday, but
> no flying because it was getting dark.
>
> On Saturday, I went to fly, and had some trouble getting it to stay running
> due to the cold temperatures. I probably didn't keep it rich enough, long
> enough. I taxied out to the far end of the runway (5000'), and took the
> runway for take off.
>
> As I accelerated to about 90 kts, I was just rotating when to power dropped
> substantially. I cut the throttle, and aborted the takeoff.
>
> I don't know exactly what caused the sag. I pulled the throttle all the way
> back during the aborted takeoff, and the engine died. I have my idle stop
> set a little low (400 RPM's), and usually don't pull it all the way off, but
> even when I do, it has never died.
>
> I restarted it, and ran the power up to about 4000, and it seemed OK.
>
> Another issue with my right main wheel bearing prevented me from making any
> more high speed runs. The right wheel has been making noise, and I was
> trying to resolve it with the mfg, but during the aborted take off, it
> really made allot of noise, and also vibrated pretty good at one speed, so I
> decided that I better get that fixed before doing any more flying.
>
> I changed the fuel regulator, so I guess that it could have been some air
> still in the fuel line, but the engine had probably run for at least 10
> minutes prior to the take off roll. It also could have been some water,
> though I've never found any to date during preflight. The engine was
> running at 5 lbs of boost and abo ut 5000 RPM's. It was about 45 degrees,
> and the plane was accelerating very strong prior to the power loss. I don't
> know if it would have picked back up, but I was glad that it didn't happen 5
> seconds later.
>
> Steve Brooks
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html

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